Almost everyone, in the UK at least, has a largely seamless experience with PayPal, Google Pay or Apple Pay these days. The shipping address gets auto-complete

Almost everyone, in the UK at least, has a largely seamless experience with PayPal, Google Pay or Apple Pay these days. The shipping address gets auto-completed by interfacing with the payment processor and there's no account sign-up. And since most of them actually outsource their websites to shopify or whoever, the user experience is basically as consistent as Amazon.